Has anyone experienced newly built mechs weapons groupings not saving? Old mechs are fine, new mechs being bought and built do not save weapon groupings in mechlab and have to be changed each drop in game. Very irritating.
I did run the repair tool but this did not fix it.

Potentially the file in the C:\Users\YourUserName\Saved Games\profile\handle\weapongroups.xml folder has been marked read only, or the file has become corrupted. You may also try running the game with Admin privileges. Usually not required but some settings may have been furbared.